685858585 has 8 divisors (see below), whose sum is σ = 830314440. Its totient is φ = 543830784.

The previous prime is 685858583. The next prime is 685858633. The reversal of 685858585 is 585858586.

It is a happy number.

685858585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 51423241 + 634435344 = 7171^2 + 25188^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685858585 - 2¹ = 685858583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685858583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 606390 + ... + 607519.

It is an arithmetic number, because the mean of its divisors is an integer number (103789305).

Almost surely, 2^685858585 is an apocalyptic number.

It is an amenable number.

685858585 is a deficient number, since it is larger than the sum of its proper divisors (144455855).

685858585 is a wasteful number, since it uses less digits than its factorization.

685858585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214027.

The product of its digits is 15360000, while the sum is 58.

The square root of 685858585 is about 26188.9019433805. The cubic root of 685858585 is about 881.8841281306.

Subtracting from 685858585 its reverse (585858586), we obtain a palindrome (99999999).

The spelling of 685858585 in words is "six hundred eighty-five million, eight hundred fifty-eight thousand, five hundred eighty-five".